Bart's Super Soft Youth Life Jacket Introducing the new Barts Youth Hinged Life Jacket! Designed for greater fit, flexibility and comfort. Inner fabric is constructed of Polyspan - a lightweight, double-knit polyester material that is smooth against the skin. The outer fabric is BioLite, an advanced material developed to be an eco-friendly alternative to neoprene. It is breathable, lighter than neoprene and contains no rubber foam. The fabric contains thousands of tiny chambers and pores formed that efficiently evacuates waters and lets air through.